The Mocal thermostats will bypass some oil through the cooler below the set temperature. Mine is the higher 203*F version and I can't make the oil get that hot. On the street the temps never get over 180*, and that's on a really hot day + running the engine hard. I have a three-way ball valve that will go in soon so that the cooler can be isolated for non-track days. Cold oil is no bueno.
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